Co-authored-by: Abhijit Valluri <avalluri2@bloomberg.net>

- Renames CloseTabsSettingsFragment.kt to TabsSettingsFragment.kt
- Renames close_tabs_preferences.xml to tabs_preferences.xml
- Adds preference options for the switching between the Grid and List tab views

The difficulty in mocking StrictMode.resetAfter is concerning.
I'm starting to second-guess whether or not making strict mode manager a class
was a good idea.

I believe this was a premature optimization: it's unclear that it would
actually improve performance and yet  we had to add several weird
workarounds to make it work that broke encapsulation. It's also
possible it would be worse for the APK size because of excessive
inlining.

tracking_protection, default_engine

show_search

This changes the error highlighting from being the entire contents of
<Button ...> to just the first line of <Button>.